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chapter9
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‎chapter9/practice/9_1/9_1.py‎

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#!/usr/bin/python
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# -*- coding: utf-8 -*-
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__author__ = 'xy'
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file = raw_input('enter file path')
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fobj = open(file, 'r')
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i = 0
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for eachline in fobj:
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if eachline.strip(' ')[0] != '#':
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# if not eachline.startswith('#')
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i += 1
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print i
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'''
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try to use startswith() and endswith()
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'''

‎chapter9/practice/9_1/9_1.txt‎

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# aaa
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# aaa
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ppp # aaa
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ppp
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ppp
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the true ans is 4

‎chapter9/practice/9_13.py‎

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#!/usr/bin/python
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# -*- coding: utf-8 -*-
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__author__ = 'xy'
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'''命令行参数。写一个程序，打印出所有的命令行参数。'''
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import sys
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for item in sys.argv:
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print item

‎chapter9/practice/9_15/9_15.py‎

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#!/usr/bin/python
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# -*- coding: utf-8 -*-
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__author__ = 'xy'
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'''复制文件。提示输入两个文件名（或者使用命令行参数），把第一个文件的内容复制到第二个文件中去。'''
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f1 = open(raw_input('enter file path 1: '))
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f2 = open(raw_input('enter file path 2: '), 'w')
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for i in f1:
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f2.write(i)
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'''
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rU 或 Ua 以读方式打开, 同时提供通用换行符支持 (PEP 278)
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w 以写方式打开，
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a 以追加模式打开 (从 EOF 开始, 必要时创建新文件)
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r+ 以读写模式打开
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w+ 以读写模式打开 (参见 w )
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a+ 以读写模式打开 (参见 a )
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rb 以二进制读模式打开
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wb 以二进制写模式打开 (参见 w )
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ab 以二进制追加模式打开 (参见 a )
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rb+ 以二进制读写模式打开 (参见 r+ )
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wb+ 以二进制读写模式打开 (参见 w+ )
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ab+ 以二进制读写模式打开 (参见 a+ )
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'''

‎chapter9/practice/9_15/test1.txt‎

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hello
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world
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xy

‎chapter9/practice/9_15/test2.txt‎

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hello
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world
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xy

‎chapter9/practice/9_16/9_16.py‎

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#!/usr/bin/python
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# -*- coding: utf-8 -*-
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__author__ = 'xy'
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'''
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文本处理。
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人们输入的字符常常超过屏幕的最大宽度，编写一个程序，在一个文本文件中查找长度大于80个字符的文本行。
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#从最接80个字符的单词断行，把剩余的文件插入到下一行处。程序执行完毕后，应该没有超过80个字符的文本行了。
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'''
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file = open
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‎chapter9/practice/9_4/9_4.py‎

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#!/usr/bin/python
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# -*- coding: utf-8 -*-
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__author__ = 'xy'
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def print_25_lines(file):
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num = 0
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for eachline in file:
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if num == 25:
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raw_input('press any key to continue')
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print_25_lines(file[25:])
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else:
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print eachline
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num += 1
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file_list = open('./test_100lines.txt', 'r').readlines()
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print_25_lines(file_list)
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'''
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with open("test_100lines.txt","a+") as fobj:
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for i in range(100):
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fobj.write(str(i))
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fobj.write("\n")
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'''

‎chapter9/practice/9_4/test_100lines.txt‎

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‎chapter9/practice/9_6/9_6.py‎

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#!/usr/bin/python
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# -*- coding: utf-8 -*-
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__author__ = 'xy'
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import hashlib
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def gethash(f):
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line = f.readline()
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hash = hashlib.md5()
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while(line):
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hash.update(line)
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line = f.readline()
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return hash.hexdigest()
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def is_hash_equal(f1, f2):
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str1 = gethash(f1)
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str2 = gethash(f2)
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return str1 == str2
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if __name__ == '__main__':
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f1 = open("./a_.txt", "r")
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f2 = open("./a__.txt", "r")
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if is_hash_equal(f1, f2):
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print 'same!'
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else:
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lines1 = f1.readlines()
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lines2 = f2.readlines()
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for i in range(min(len(lines1), len(lines2))):
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if lines1[i] != lines2[i]:
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print i
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break
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'''
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compare two files' MD5 value
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'''

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